Add authentication support to Nightscout (#40602)
* Add API Key to the Nightscout integration config
* Add tests for nightscout config changes
* Apply suggestions from code review
Co-authored-by: springstan <46536646+springstan@users.noreply.github.com>
Co-authored-by: Chris Talkington <chris@talkingtontech.com>
* Update homeassistant/components/nightscout/__init__.py
* Run translations script to fix en.json
Co-authored-by: springstan <46536646+springstan@users.noreply.github.com>
Co-authored-by: Chris Talkington <chris@talkingtontech.com>
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